What does this bit do?

Hello

just got a frame I really like off ebay (http://ubuntuone.com/p/pAc/ - headbadge; http://ubuntuone.com/p/pAd - dropouts; the winner of the 1947 Tour de France rode a Genial Lucifer, apparently!).

I want to run a gear cable under the botom bracket but what's there at the moment is:
http://ubuntuone.com/p/pAg/

I was wondering if anyone could tell me what would orginally have been attached to that,please? I don't want to take it off and I'm wondering how I can guide the cable - thinking perhaps I can bolt a little pulley wheel to it?

Thanks

Dave

It's a display bike for display purposes only. This would have been mounted in a shop window on a purpose-built stand.

That was quick! Thanks for the reply. Is there anything else that I might need to know about a 'display purpose only' frame? Looks as thought it's been ridden a fair amount so I suppose it's built properly!
Cheers

Genial Lucifer?! That's ace.

I'm gonna suggest it's a mount for one of the old derailler systems I know bugger all about.

There's a bunch of examples here: http://velosvintage.over-blog.com/

Osgear: http://www.classiclightweights.co.uk/osgear.html

Oscar Egg! Set the hour record 3 times.

Yes, it must be for the osgear - the frame has the specific dropouts - No. 25A in fact! http://www.classiclightweights.co.uk/designs/osgear-hs.html
Thanks for that, mystery solved!!

Dave

Bit more on osgear dropouts here:

http://www.flickr.com/photos/49353569@N00/2701416436/

http://www.flickr.com/photos/2kings/2839061776/ - on a claud butler showing the shifter